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add default scroll position #2

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add default scroll position #2

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29 changes: 27 additions & 2 deletions lib/adsorptionview_flutter.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ class AdsorptionView<T extends AdsorptionData> extends StatefulWidget{
final List<T> adsorptionDatas;
final GetHearWidget<T> headChild;
final GetGeneralItem<T> generalItemChild;
final int initialIndex;
final double itemHeight;
final double itemWidth;
final double cacheExtent;
Expand All @@ -18,6 +19,7 @@ class AdsorptionView<T extends AdsorptionData> extends StatefulWidget{
@required this.adsorptionDatas,
@required this.headChild,
@required this.generalItemChild,
this.initialIndex:0,
this.itemHeight:50.0,
this.itemWidth:double.infinity,
this.cacheExtent:30.0,
Expand All @@ -36,7 +38,20 @@ class AdsorptionView<T extends AdsorptionData> extends StatefulWidget{
///此控件适用于固定高度的ListView
class AdsorptionViewState<T extends AdsorptionData> extends State<AdsorptionView<T>>{

ScrollController scrollController=new ScrollController();
ScrollController scrollController;

@override
void initState() {
super.initState();

var initialScrollOffset = 0.0;

if(widget.initialIndex >= 1) {
initialScrollOffset = (widget.initialIndex - 1) * widget.itemHeight;
}

scrollController = new ScrollController(initialScrollOffset: initialScrollOffset);
}

@override
Widget build(BuildContext context) {
Expand Down Expand Up @@ -65,6 +80,7 @@ class AdsorptionViewState<T extends AdsorptionData> extends State<AdsorptionView
child: new HeaderView(
scrollController: scrollController,
headChild: widget.headChild,
initialIndex: widget.initialIndex,
adsorptionDatas: widget.adsorptionDatas,
itemWidth: widget.itemWidth,
itemHeight: widget.itemHeight,
Expand Down Expand Up @@ -141,13 +157,15 @@ class HeaderView<T extends AdsorptionData> extends StatefulWidget{
final ScrollController scrollController;
final double itemHeight;
final double itemWidth;
final int initialIndex;
final GetHearWidget<T> headChild;
final List<T> adsorptionDatas;

HeaderView({
@required this.scrollController,
this.itemHeight:50.0,
this.itemWidth:double.infinity,
this.initialIndex:0,
@required this.headChild,
@required this.adsorptionDatas,
});
Expand All @@ -165,7 +183,14 @@ class HeaderViewState<T extends AdsorptionData> extends State<HeaderView<T>>{

@override
void initState() {
headerStr=widget.adsorptionDatas.first;
var headerIndex = 0;
for(int i=widget.initialIndex; i>=0; i--) {
if(widget.adsorptionDatas[i].isHeader) {
headerIndex = i;
break;
}
}
headerStr=widget.adsorptionDatas[headerIndex];

widget.scrollController.addListener((){
//计算滑动了多少距离了
Expand Down